Mark McGwire 70th Home-Run Ball

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Became A Part Of Sports Lore In: 1998What It’s Worth: $2.6 million

Todd McFarlane, creator of Spawn, proves that comic-book nerds can also be sports geeks. A year after being caught up in the home-run race between Mark McGwire and Sammy Sosa during the 1998 season, McFarlane won McGwire's sports-milestone-setting ball with a bid reportedly well above all other offers. Experts now estimate the ball is now worth around a third of what McFarlane paid, but we can't be sure until he tries to sell it.